James Holmes in a photo from the Arapahoe County (Colo.) Sheriff's Office.

In the weeks before the attack, James Holmes took photos of the Colorado movie theater where 12 people were killed and dozens more wounded in last summer's mass shooting, prosecutors revealed Wednesday at a court hearing in Colorado.

"In one, marked 6:22 p.m., he was wearing black contact lenses. His hair was dyed red under a black cap, and he stuck out his tongue at the camera. In another image, he is seen smiling with the muzzle of a Glock handgun in the frame. Prosecutors told the court they introduced the self photos because they help show Holmes' 'identity, deliberation and extreme indifference.' "

Wednesday was Day 3 of a preliminary hearing to officially determine whether there's enough evidence to go forward with a trial. The proceedings are now over, local news outlets say, and the 25-year-old Holmes' attorneys chose not to call any witnesses. It's thought they may try to argue that he is insane.